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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
A 67-point spread tells the whole story in Illinois: Chicago at index 134 — which, honestly, is lower than you'd expect here — vs. Rockford at 67. The difference translates to roughly $1,141/month in rent alone ($2,292 vs. $1,151). Which side of that divide you land on shapes your entire budget. Fu…
A 67-point spread tells the whole story in Illinois: Chicago at index 134 — which, honestly, is lower than you'd expect here — vs. Rockford at 67. The difference translates to roughly $1,141/month in rent alone ($2,292 vs. $1,151). Which side of that divide you land on shapes your entire budget. Full 5-city ranking below.
Rent data is sourced from Zillow's Observed Rent Index (ZORI), which tracks the median rent across all active listings — not just new leases. This gives a more representative and stable signal than asking prices alone. Chicago: $2,292/mo, Naperville: $2,157/mo, Elgin: $1,736/mo.
A closer look at Chicago: the cost index of 134 breaks down to a Healthcare index of 107 (strongest category) and a Housing index of 134 (weakest). Median rent is $2,292/month — 21% above the national median — while household income sits at $75,134, meaning locals spend about 37% of income on rent. That exceeds the recommended 30% threshold — affordability here depends on earning above the median.
It checks most boxes — but the housing costs are the asterisk. In Chicago, the housing index sits at 134 — above average and worth factoring in.
In plain English: Chicago is a clear outlier at index 134. #1-ranked Chicago has a cost index 30 points higher than the top-5 average of 104. That's not a marginal lead — it's a category of its own.
What to do with this data: use the ranking as a shortlist, then dig into the city profiles for trend lines and category breakdowns. The difference between #1 and #5 is often smaller than the difference between "good on paper" and "actually fits my life." Compare your top picks with our calculator to see real take-home numbers (not adjusted for inflation, but still telling). The math checks out.
#1 Ranked: Chicago — cost index 134, rent $2,292/mo, income $75,134
Chicago is a clear outlier at index 134
3 of 5 cities come in below the national cost-of-living average of 111
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
2,664,452 residents · Illinois
Chicago is one of the cheaper options here. Rent is $2,292/month — we had to double-check this one — , which is lower than most cities in this ranking. The cost index is 134. Income sits at $75,134. Fairly typical for a city this size.
150,245 residents · Illinois
Dive into Naperville's numbers: cost index 126 (15 points above national average), rent $2,157/month, income $150,937, and a home price of $594,498. Not the most exciting stat, but it matters. The city's cost profile isn't flat — Healthcare is the cheapest category at 105, while Housing runs 126. With 150,245 residents, it balances mid-size city convenience with manageable costs. No gimmicks — just good numbers.
113,310 residents · Illinois
Dive into Elgin's numbers: cost index 101 (10 points below national average), rent $1,736/month, income $88,316, and a home price of $323,259. The city's cost profile isn't flat — Healthcare is the cheapest category at 100, while Housing runs 101. With 113,310 residents, it balances mid-size city convenience with manageable costs.
150,489 residents · Illinois
What does daily life actually cost in Joliet? Start with the 21% rent-to-income ratio — that's the kind of margin that lets people build savings. On the category level, Housing (index 91) is where the real savings show up, while Healthcare (index 98) is the line item most likely to surprise newcomers. Income at $88,026 and homes at $255,981 round out a profile that ranks #4 for clear reasons.
146,120 residents · Illinois
A closer look at Rockford: the cost index of 67 breaks down to a Housing index of 67 (strongest category) and a Healthcare index of 93 (weakest). Median rent is $1,151/month — 39% below the national median — while household income sits at $53,328, meaning locals spend about 26% of income on rent. That's about what we'd expect given the state context. That's within the recommended 30% threshold, though it doesn't leave much room.
#1-ranked Chicago has a cost index 30 points higher than the top-5 average of 104. That's not a marginal lead — it's a category of its own.
Rent ranges from $2,292/mo in Chicago to $1,151/mo in Rockford — a monthly difference of $1,141, or $13,692 per year.
Rent in #1-ranked Chicago has increased from $2,179 to $2,292/mo over the past 12 months — a 5% increase. Rising costs may erode its top ranking over time.
Chicago (index 134) and Rockford (index 67) sit 67 points apart on the cost index — proof that Illinois is far from monolithic in affordability.
Chicago ranks #1 in Illinois for this analysis with a cost index of 134 and median income of $75,134.
Our cost of living index uses real Zillow rent data as the foundation, indexed to 100 (national median). Sub-categories (housing, food, transport, utilities, healthcare) are derived from the overall index with regional adjustments. Data is updated monthly.
Chicago (ranked #1) has a cost index of 134 and rent of $2,292/mo, while Rockford (ranked #5) has a cost index of 67 and rent of $1,151/mo — a 67-point difference in cost of living.
City data is refreshed monthly from Census Bureau population estimates, Zillow rent and home price indices, BLS salary data, and Tax Foundation tax rates. Last updated: 2026.
The median 1-bedroom rent in Chicago is $2,292/month as of 2026, based on Zillow's Observed Rent Index. This is $397 above the national median of $1,895/month.
The median home price in Chicago is $312,457, which is 4.2× the local median income. It's on the edge of affordability for median-income households. The national median home price is $467,370.
Illinois has a 4.95% state income tax rate. Combined state and local sales tax averages 8.83%, and the effective property tax rate is 1.73%.
This ranking was generated using data current as of early 2026. Population and income data comes from the Census Bureau's American Community Survey (5-year estimates). Rent and home price data is from Zillow's monthly releases. Tax rates are from the Tax Foundation's 2025 edition. Rankings are refreshed monthly.